Music Major?? Please help?

Last year I started really getting serious about playing my instrument....I practice almost everyday and it is my top priority. I started taking private lessons last year and I got my braces off so I have and am continuing to improve. I go to a competitive school and last year I was in the low band for freshman, but this year I made the middle band (I play second part) for sopres, juniors, and seniors which is considered pretty good at my school. I don't play any other instruments, just trumpet. I played guitar for a couple months a couple years ago but that's it....so I don't really have any piano experience other than playing scales (with improper technique) based on the scale formulas. However, nothing else would make me happier than devoting my life to music....I don't know if I would want to be a music ed or a performance major. I am in marching band and pep band, but this year I plan on joining jazz band as well. I just wonder if I would be good enough....and I think my band director and peers would be shocked because I just don't appear like the type of student who would become a music major. Next year, I hope to take music theory 1 and 2 at my school and then AP music theory my senior year. To any music majors out there, do you have any advice? Do you think I could really do it? Could I email you with any questions regarding becoming a music major? And next year I want to start tutoring 6th graders (basically giving them private lessons where I charge $5). It just sounds so fun to me! And last year I would practice with my friend once a week to teach her the audition music from last year......and I'm going to start teaching her again (for free since she's my friend :)). It's just so fun for me to be able to teach her! I love it!